Twin crank bed motion



July 9, 1946. w. sEYBoLD 2,403,760.

TWIN CRANK BED MOTION Filed Jan. 151,- 1944 Patented July 9, 1946 rrederi'ckweyboia, Westfield, N. J., assignor to AmericanlType Founders, Inc., Elizabeth, N. J

a corporation ofNew J ersey`r f Application January 31, 1944, SerialfO. 520,559

9 Claims.

This invention relates toA bed motions-and, more particularly to such motions which are especially Qther ,objectsV or features of v'novelty willbe y apparent from @the Afollowing specification rwhen adapted. for `application tothelciprocating beds 'y ofbed and cylinderprinting presses.n e The general lobject of the invention is,` to ,pro-

videpan improved 'bed motionffor printing presses or the like,in which' the ,impression cylinder rotates at a constantflinear velocity, and in which a novel transmission is employed to oscillate theY tools or the use of special processes, the entire action of all parts being continuous Without periodic engagement and disengagement withV each other.

per end and adapted to extend therefrom in ay generally downward direction. The lever has a combinedpivotal andtranslatory movement. in a plane generally'parallel with the directionY of movement' of the bed. The particular movement of the lever to yield the desired bed velocity curve is effected by the use of two cranks, these cranks being -disposedpreferably Yupon yone sideof the lever and having theiraxessubstantially perpendicular to the plane of swinging movement of the lever. each other as well as having dilerentY throws and angularvelocities. n

The crank pins of the cranks are connected respectively with an intermediatepoint on the lever and the lower end thereof byv means of links which extend in, generally horizontal directions. l To attain the velocity curve shown in Figure 2 of the drawing, for example, in which the period of uniform bed movement extends from approximately 40 to approximately 120 ofthe cycle of movement, the crank f. which is connected with the lower end ofy the lever vis, driven three times as fast as th'e crank connected to the intermediate point and is initially set 217 `inadvance of the intermediate crank,the intermediate crank at that ,initial point of the bed movement being horizontal andvextending toward the lever.,V Both cranks are rotated Yin the same direction, and theratio ofthe length f theintermediate crank tov that of the end crank'is 1 to .1056. Also, in order 'to lprovide the particularv bed velocitycurve shown in Figure 2, the other dimensions and distances involved in the `novel bed motion should be in the proportions indicated in the table com-- Pr/iSngFigure B Ofthe drawing.:

The two cranks are out of phase withr read in `connection with' the acc,omparnling,tirenting in which oneembodiment of the inventionv is illustrated by wayvofexample. Y..-

kIn the drawing,

Figure 1 'is a diagrammatic View in side 4elevation lof a bedand cylinder press embodying the principles ofthe invention; Y Y,

.Figure `2 is a graph comprising the displacement curve in which displacement of the bed is plotted against the crank angle of th'ezintermediate crank; and Y Figure 3 is a tabulation of the relative proportions of the dimensions and, distances,y shown in Figure 1, in order to attain the displacement curvev y of Figure 2.

In the diagrammatic view constituting Figure Y l of the drawing there is illustrated a bed and cylinder press, the rotating impression cylinder being indicated at yHl andthe reciprocating bed at-H. Asuitable bearing surface I2 is provided along Vwhich the bed is adapted to move, carrying the printing form I3Y into and out of contact with thepaper on lthe impression cylinder lil. Suitable antifriction elements for facilitating the movement of the bed are indicated at I4. During vpart of its travel, the form may be brought into contact with conventional inking mechanism of which thevtwo form rollers l5v are representative. The impression cylinderv Hl is driven vfrom the mainpower means of the press through suitable gearing `which ralso maybe conventional and which it is unnecessaryto show in the present disclosure. Y A driveV gear I6 suitably connected with the power means soas to be driven with uniform motion 'and in synchronism with theY impression cylinder is rotatably mounted at the lowerrportion of the press frame. The gear I6 meshes with an idler l1, which is preferably of the same diameter as the driven gear I8, which provides one of the cranks for moving the bed l l. A smaller vgear I9 is also driven by the idler l1 but this gear is only one-third the size of the gears I'l and I8. gears I8 and I9 are driven in the same direction of rotation, shown in the illustratedexample as being clockwise.

A lever 20 has its upper end pivotally connected to an ear or lug 2| secured to thel reciprocating bedzll, the pivot point being designated C, and being for convenience of illustration situated on the level of the bearing surface I 2. A link 24 pivotally connects an intermediate point B of the lever "20 with a point A of the crank gear I8. Another link 25y connects-the lowermostpoint E of theV lever 20 Witha point'G on' the smaller crank gear i9. The Vcenter -of the larger crankl gear i8 is indicated at O and the center of the smaller gear. vIllas designated F; and .thusvthe driving The y 3 crank for the intermediate portion of the lever is of the length O-A and the crank length for the lower end'of the lever is F-G. The centers O and F are in vertical alignment and a line connecting these centers intersects the surface I2 (which, in this case, is the path of the pivot point C) at the point H.

In Figure 1 of the drawing, all of the parts are shown in their initial positions-with the bed at its extreme left hand point. Under these conditions, the crank O-A is horizontal and extending to the left of the center of thecrank gear I8, and this horizontal position will be taken as the zero position in diagramming the movementl of the bed. The initial position of the crank F--G is one which is displaced 37 below the horizontal in a clockwise direction, in other words, 217 in advance of the crank O-A. l

It has been found that in order to give unifor motion of the bed for a substantial portion of the stroke in one direction (a little more than 80 in this case) the various cranks, linkages, lever portions, and distances should` have the relative lengths set forth in the following table:

Distance Unit length With these dimensions, and the initial positions of the points A and G as indicated, the displacement diagram of the bed will be as shown in Figure 2 of the drawing. In this graph, the bed displacement is plotted against the crank angle of the crank O-A. It will be Seen that the curve is practically a straight line beginning a little below the 40 point and extending slightly beyond the 120 point. v l,

The positions of the principal points, of the bed drive, at the start ofl the uniform motion period are indicated by the same letters but with the subscript 1. For example, the pivotal connection between the lever 20 and the bed will be at the point Ci and the lever will be dened by the points C1, B1, and E1. At this time, the pivotal connection of the link 24 with the crank gear I8 will have moved to lthe point A1, displaced by 40'fr0m the zer-o point A. Since the initial position of the point G was at 217, and since the gear I9 rotates three times as fast as the gear I8, the point of pivotal connection with the link 25 and the gear I 9 at the beginning of the period of uniform motion, will be at G1 spaced 337.from the zero point.

At the end of the period of uniform motion the bed connected lever 20 will be in position the main crank will have moved through 120, Ithe pivot point being at Az; and the point G will have made a complete revolution around the center F, whereby the positions G and'G2 are identical.

After the period of uniform motion is concluded the bed moves on to the end of its printing stroke and then through its return stroke, which does not necessarily have any uniform velocity portion, back to the zero point at the left hand end of'its travel. Y, l' Suitablelmechanism for lifting'the impression 4 cylinder during the return stroke of the bed is provided, and it is understoodthat, all other necessary or convenient parts usually associated with presses of this character may be employed, al-

Ythough only that much of the press as is necessary for a disclosure of .the present invention is shown j in theV drawing.

It is understood that terms of orientation used in the specification and claims, such as above, below,v horizontaL etc. are used in an exemplary sense only, and if the plane of movement of the bed is changed from the horizontal, the terms describing the positions or movementsof the other parts must be altered accordingly to preserve the relative positions and relationships of the various parts, within the principles of the'invention.

Various changes and modications may be made in the embodiment illustrated and described herein without departing from the scope of the invention as defined by the following claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is: v. Y

1. A bed motion of the class described comprising, in combination, a reciprocating bed, means for driving the bed comprising a lever having one end pivotally connected with the bed and extending at an angle tothe direction of movement of the bed, a power driven'lcrank operatively connected with an intermediate'portion of said lever, another power driven crank operatively connected'with the end of said lever remote from said bed, and power means'unconnected with said lever or bed except through said cranks for driving said cranks at diiferent angular've-- Vto said lever at an intermediate point, another power driven crankthe axis of which isV also substantially perpendicular toY said plane,V means operatively connecting said second crank with the end of said lever remotefrom, said bed, and power means unconnected with said lever or bed except through said cranks fordriving said cranks at different uniform angular velocities, the velocity of one of said cranks being an even multiple of that of the other.I f

3. A bed-motion of the class'described comprising, in combination,V aKV reciprocating bed, means for driving the bed comprising `a lever having one end pivotally connected .with the bed and extending ina generally perpendicular Adirection therefrom, and adapted to swing about its pivotal connectionwith the bed during operative movement, and-a crank the axis-of rotation of which is substantially perpendicular to the plane of swinging movement of theflever, a link operatively 'connecting said crankto saidV lever at an intermediate point, another crankthe axis of which is also substantially perpendicular to said plane,'anothe`r Vlink operatively connecting said second crankvwith the end of -said leverremote from said bed, and means forfdiiving said cranks at differentunifonn'angular lvelocities,

the velocity of the end crank being an even multiple of that of the intermediate crank.

4. A bed motion or the class described comof which is also substantially perpendicular tosaid plane, means operatively connecting said second crank with theend of said lever remote from said bed, and means for driving said cranks at different uniform angular velocities,` the velocity of one of said cranks being an even multiple of that of the other, both of said cranks being spaced from said lever in the direction of longitudinal movement of said bed and positioned so that the projection of a line joining the axes or said cranks intersects the plane of movement oi the bed substantially at right angles.

5. A bed motion oi the class described comprising, in combination, a reciprocating bed, means for driving the bed comprising a lever having one end pivotally connected with the bed and extending in a generally perpendicular direction therefrom, and adapted to swing about its pivotal connection with the bed during operative movement, and a crank the axis or rotation of which is substantially perpendicular to the plane of swinging movement of the lever, a link operatively connecting said crank to said lever at an intermediate point, another crank the axis of which is also substantially perpendicular to said plane, another link operatively connecting said second crank with the end of said lever remote from said bed, and means for driving said cranks at diierent uniform angular velocities, the velocity of the end crank being three times that of the intermediate crank, both of said cranks being spaced from said lever in the direction of longitudinal movement or said bedand positioned so that the projection of a line joining the axes of said cranks intersects the plane of movement of the bed substantially at right angles.

6. The bed motion set forth in claim 5, in which both cranks rotate in the same direction and when the bed is in one of its extreme positions,

the intermediate crank is parallel with the direction of movement of said bed and the end crank is 217 in advance of the position of said intermediate crank.

7. In a bed motion of the class described, in combination, a supporting frame, a horizontally reciprocating bed, a lever pivotally connected at its upper end with said bed and adapted to swing about its pivotal point in the general direction of movement of said bed, a crank rotatably mounted upon said frame at one side of said lever and having its axes perpendicular to the plane of swing of said lever, a link operativelyconnecting said crank with the midpoint of said lever, a second crank mounted for rotation on said frame with its Vaxes directly below that of said -rst named crank, the `projection of a line joining said axes being perpendicular to and intersecting the extension of the locus of the point of pivotal connection between the bed and the lever, means for driving said rst named crank, means for driving said second named crank at three times the angular velocity of the first named crank, the

relative dimensions of the parts being as follows:

Units Length of lever 51/3 Length of first named crank 1 Length of rst named link 45/9 Length of second named crank .1056A Length of second named link '4% Distance of axes of first named crank from locus of lever and bed pivot 2% Distance of axes of second named crank from locus of lever and bed pivot 51/3 8.1m a bed motion of the vclass described, in

combination, a supporting frame, a horizontally reciprocating bed, a lever pivotally connected at its upper end with said bed andadapted to swing about its pivotal point in the general direction of movement of said bed, a crank rotatably mounted upon said frame at one side of said lever and having its axes perpendicular to the plane of swingv of said lever,A a link operatively connecting said crank with the midpoint of said lever, av

second crank mounted for rotation on said frame with its axes directly below that of said rst named crank, the projection of a line joining said axes being perpendicular to and intersecting the extension of the locus of the point of pivotal connection between the bed and the lever, means for driving said rst named crank, means for driving said second named crank at three times the angular velocity of the rst named crank, the relative dimensions of the parts being as follows:

- Units Lengthof lever 51A; Length of iirst named crank 1 Length of rst named link 4% Length of second named crank .1056 Length of second named link 4% Distance of axes of rst named crank from locus of lever and bed pivot 2% DistanceV of axes of second named crank from locus of lever and bed pivot 51/3 the position of said first named crank being horizontal and extending toward said lever when the bed is in its remote position from said crank, and the position of said second named crank at that time being 217 in advance of said first named crank, both cranks rotating in the same direction.

9. A bed motion of the class described comprising, in combination, a reciprocating bed, means for driving the bed comprising a leverhaving one end pivotally connected with the bed and extending in a generally perpendicular direction therefrom, and adapted to swing about its pivotal connection with the bed during operative movement, and a crank the axis of rotation of which is substantially perpendicular to the plane of swinging movement of the lever, means operatively connecting said crank to said lever at an intermediate point, another crank the axis of which is also substantially perpendicular to said plane, means operatively connecting said second crank with the end of said lever remote from said bed, and means 

